DGH D8300 Analog Thermocouple Input USB Module

The D8300 7-channel thermocouple input module is part of the DGH’s D8000 data acquisition module family with USB interface. This input module measures signal from a choice of eight different thermocouple types (J, K, T, E, R, S, B and C) and each channel can be programmed for a different range. It then continuously converts the data at the rate of up to 25/20 conversions per second, storing the latest result in the buffer. The D8300 modules communicate in MODBUS RTU protocol; the data can therefore be retrieved by sending a MODBUS query to the module from the host computer. The D8300 thermocouple input module can be directly connected to a wide range of sensors and annunciators, and provides all signal conditioning and linearisation, while containing no pots or DIP switches. For extra security, it utilises a non-volatile EEPROM (Electrically Erasable Programmable Read Only Memory) to store all user-selectable settings such as the range, meaning the values are maintained in the event of power loss. The D8300 module is compatible with any commercial software supporting Modbus RTU protocol and is DIN-rail mountable (MK-1 mounting kit required). Combined with other D8000 series modules, a complete, customised data acquisition system can be built easily.

• 7-channel differential analog thermocouple input module
• Choice of 8 different thermocouple types: J, K, T, E, R, S, B and C (see Specification tab for temperature ranges)
• Modbus RTU protocol
• Connects to the computer via the USB interface
• User-selectable features include analog input range per channel, baud rate, parity type, digital filtering and others
• 16-bit ADC, 25/20 conversions per second
• Compatible with all commercial software programs supporting Modbus RTU protocol, including programs from Wonderware, DreamReport, National Instruments Labview, Indusoft and others
• Accuracy (error from all sources at 0-40°C ambient): ±1.5°C maximum (J, K, T, E) or ±3.5°C maximum (R, S, B, C)
• Automatic cold junction compensation
• Input burnout protection to 250 Vac
• Input impedance: 20MΩ minimum
• Lead resistance effect: <40μV per 350Ω
• Open thermocouple and over range indication
• Power requirements: Serial = 1.4W
• Temperature range -25°C to +70°C
• Mix and match with other D8000 modules to build a complete, customised data acquisition system

The applications for the D8000 data acquisition modules include:

• Process monitoring and control
• Data logging to any host computer
• Product testing